Guard device for sewing machines



H. c. NlssEN 2,302,390

GUARD DEVICE FOR SEWING MACHINES Nov. 17, 1942.

Filed Slept. 14, 1940 H-ny a Nissen Patented Nov. 17, 1942 GUARD DEVICEFOR SEWING MACHINES Henry C. Nissen, Stratford,

The Singer Manufacturing Company,

Conn., assigner to Elizabeth, N. J., a corporation of New JerseyApplication September 14, 1940, Serial No. 356,748

(Cl. 11B-261) S Claims.

This invention relates to guards for sewing machines, and moreparticularly to a sewing machine provided with a trimmer mechanism andhaving a loop-taker rotating about an axis substantially parallel to thepath of needle-reciprocation.

The primary object of this invention is t provide means obvating foulingof the loop-taker of a sewing machine by trimmed-ori portions of thework, and especially in a sewing machine in which the work is trimmedclose to the point of stitch-formation.

Other and more speciiic objects of the invention will be apparent fromthe following description and claims.

The invention consists in the guard device as hereinafter described inconnection with the accompanying drawing which illustrates a preferredembodiment of the invention and in which:

Fig. l is a top plan view of a portion c-f the bed-plate of a sewingmachine containing the improved guard device, the usual bed-slide beingremoved and the movable trimmer-knife being shown in section. Fig. 2 isa front side elevation, partly in vertical section, of the loop-takerbracket, trimmer-knife and feed-dog as associated in the machine, thesection being taken substantially on the line 2 2 of Fig, l. Fig. 3represents a perspective view of the loop-taker and feed-dog guard,shown partly broken away. Fig. 4 is a bottom plan view of thethroat-plate and attached ledger-blade. Fig. represents a perspectiveview of the throat-plate` with the ledgerblade omitted.

Referring to the drawing, the sewing machine has the usual work-supporto-r bed-plate I provided with an opening 2 overhung by a throatplate 3;the throat-plate being secured at its opposite ends upon the bed-plate Iby screws 4. The throat-plate 3 is provided with an aperture 5 toreceive the usual vertically reciprocatory eyepointed needle 6, saidthroat-plate also having feed-slots 1 thro-ugh which the feed-dog 3 isupwardly projected to advance the work.

The throat-plate 3 is formed or cut away to provide a depression 9 inthe upper face of the throat-plate directly in front of theneedle-aperture 5. The depression 9 of the throat-plate is adapted toreceive the delivery end of a transverse binder (not shown), of anyusual or suitable construction. The side portion of the throatplatedirectly in front of the depression 9 is cut away to provide anedge-wall I0 extending transversely of the line of seam formation anddening the rearward portion of a clearance recess II in the side edge ofthe throat-plate 3.

The front end portion of the throat-plate 3 is recessed to receive theshank of a ledger-blade plate I2 secured upon the throat-plate by thefront throat-plate securing screw 4. The plate I2 has a ledger-blade I4overlying the side margin of the throat-plate directly adjacent thefeeddog 8 and extending rearwardly to the throatplate recess II.

The outer edge of the ledger-blade I4 at the rearward end thereofextends 4substantially parallel to the line of seam formation, andcoacting with said edge in severing work is a movable trimmer-knife I5attached to a carrier-arm I6 which may be actuated in any usual orsuitable manner. It will therefore be understood that the trimmer-knifeacts to sever the work closely in front of the needle and at one side ofthe line of seam formation.

Complemental to the needle 6 in the formation of lock-stitches is aloop-taker I'I of the verticalaxis rotary hook type, i. e., of the typein which the axis of rotation of the loop-taker is substantiallyparallel to the path of reciprocation of the needle. The loop-taker I'Ihas the usual upwardly open cup-shaped body provided in the cylindricalside wall thereof with a needle-thread loop seizing beak I8. suitablyjournaled in the loop-taker I'I and restrained against rotationtherewith is an upwardly open bobbin-holder I9 receiving a bobbin 2i).The bobbin 20 is removably retained in the holder I9 by a latch 2| andthe thread wound upon the bobbin is interlocked with the needle-threadin the formation of stitches.

The loop-taker I1 is rotated about a vertical axis by actuatingmechanism in part carried by a bracket or hook-saddle 22, the loop-takerI1 being disposed above the upper face 22 of the hook-saddle and partlyunderlying the throatplate 3. The hook-saddle 22 is disposed below thebed-plate, and in the present case the looptaker and hook-saddle aresimilar to those disclosed in the U. S. patent to W. Myers, No. 2,095,-450, Oct. 12, 1937.

The present invention relates more particularly to the provision ofmeans for guarding the loop-taker Il, which ro-tates at high speedduring the operation of the machine, from entrance and entanglement bytrimmed-off work-margins which are deflected downwardly through anopening 23 provided in the bed-plate I in front of the loop-taker.

To this end, there is provided a stationary segmental guard-memberhaving a curved side wall 24 conforming in curvature to and encompassingthe front portion of the cylindrical side wall of the loop-taker I1 inclose proximity thereto. Extending outwardly from the lower portion ofthe side wall v24 of the guard-member is a supporting shank 25 which isapertured to receive screws 26 for rigidly securing the guard-memberupon the upper face 22 of the hook-saddle 22.

The curved side wall of the guard-member is provided at the upper edgethereof with an inwardly extending flange 2l overhanging a segmentalportion of the rim of the loop-taker I1 and of the bobbin-holder I9,said flange 21 exposing the bobbin'20 for removal thereof. To facilitateremoval of the bobbin 20 from the loop-taker il, the guard-flange 21 isprovided in the horizontally flat upper face thereof with a notchedrecess 28 affording access to the upper rim of the bobbin. The underface 21 of the guard-flange is preferably inclined downwardly from theinner free edge of said ilange to add to the rigidity f theguard-member.

At one end of the guard-member, the upper face of the flange 2 thereofis partly cut away to provide a transverse shoulder 29 and a depressedland Sll. The flange-land 30 underlies the throat-plate depression 9, asillustrated by dotted lines in Fig l of the drawing. Extendingsubstantially tangentially and forwardly from the flange-land 3U, underthe throat-plate, is a guard-wing 3|, of which the upper edge isdisposed close to the under side of the throat-plate. The guard-wing 3iis also disposed closely adjacent to the portion of the feed-dog 8 inadvance of the needle and at the trimmer side of said feed-dog, therebyto guard the feed-dog from engagement by trimmed-off portions of thework.

The guard-ange shoulder 29 extends transversely of the line of seamformation into the throat-plate recess Il, the upper edge of theshoulder 2i) being substantially even with the upper face of thethroat-plate depression 9. It will therefore be understood that theguard described eifectively shields the loop-taker Il and feed-dog 8from entanglement by trimmed-off portions of the work, thus permittingthe trimming operation to be performed closely in front -of the needleand thereby facilitating the handling of the work, without interferingwith the operation of the loop-taker 'l or the removal of the bobbin 2therefrom.

Having thus set forth the nature of the invention, what I claim hereinis:

1. In a sewing machine having an endwise reciprocatory eye-pointedneedle, and a looptaker rotating about an axis substantially parallel tothe path of needle-reciprocation, the improvement which consists in theprovision of a stationary segmental guard-member partly encompassingsaid loop-taker in close proximity thereto, said guard-member having aflange overhanging a portion of said loop-taker.

2. In a sewing machine having an endwise reciprooatory eye-pointedneedle, and a loop-taker rotating about an axis substantially parallelto f the path of reciprocation of the needle, said looptaker having anupwardly open cup-shaped body, the improvement which consists in theprovision of a curved guard-member partially encompassing thecylindrical side wall of said loop-taker body, said guard-memberoverhanging the rim of said body, and means detachably securing saidguard-member in loop-taker shielding position.V

3. In a sewing machine having an endwise reciprocatory eye-pointedneedle, a loop-taker rotating about an axis substantially parallel tothe path of needle-reciprocation, and a hook- ;saddle bracket in whichsaid loop-taker is rotatably journaled, the improvement which consistsin the provision of a loop-taker shielding guardmember partiallyencompassing said loop-taker, said guard-member being detachably securedupon said bracket.

il. In a sewing machine having an endwise reciprocatory eye-pointedneedle, a loop-taker rotating about an axis substantially parallel tothe path of needle-reciprocation, and a hooksaddle bracket supportingsaid loop-taker, the improvement which consists in the provision of aloop-taker shielding guard-member having a side wall provided with aflange overhanging said loop-taker, said guard-member having a shankdetachably secured upon said bracket.

5. In a sewing machine having a work-support including a throat-plateprovided with a feedslot and a needle-aperture, an endwise reciprocatoryneedle, a loop-taker rotating about an axis substantially parallel tothe path of needlereciprocation, a hook-saddle bracket supporting saidloop-taker, and a feed-dog operating through said feed-slot, saidwork-support having an opening in front of said loop-taker, theimprovement which consists in the provision below said work-support of aguard-member extending across the front of said loop-taker and having awing disposed adjacent said feed-dog forwardly of' said needle-aperture,said wing extending substantially parallel to the line of seamformation, and said guard-member being supported by said hook-saddlebracket. i

6. In a sewing machine having a work-suppor including a throat-plateprovided with a needleaperture and a feed-slot, an endwise.recip-roeatery needle, a loop-taker rotating about an axissubstantially parallel to the path of needlereciprocaticn, awork-advancing feed-dog operating through said throat-plate feed-slot, aledger-blade carried by said throat-plate, and a trimmer-knife coactingwith said ledger-blade in advance of said needle-aperture in thethroatplate, the improvement which consists in the provision of meansfor shielding said loop-taker and feed-dog from entanglement bytrimmed-01T portions of the work, said means comprising a guard-memberhaving a segmental side-wall partially encompassing said loop-taker inclose proximity thereto and having a flange overhanging said loop-taker,said guard-member extending under said throat-plate and having asubstantially tangential wing extending forwardly therefrom adjacent tosaid feed-dog, and means for detachably supporting said guard-member inloop-taker and feed-dog shielding position.

7. A loop-taker and feed-dog shielding guardmember for sewing machines,having a segmental side wall provided with an attaching shank and withan inwardly overhanging flange, said side wall having a substantiallytangential Wing eX- tending from one end of and disposed adjacent tosaid side wall.

8. A loop-taker and feed-dog shielding guardmember for sewing machines,having a segmental side wall provided with an inwardly overhangingfiange, said fiange being partly cut away in its upper face at one endthereof to denne an abutment-shoulder, and a wing extendingsubstantially tangentially from the abutment shoulder end of saidguard-member and disposed adjacent to said side wall.

HENRY C. NISSEN.

